Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

A medieval setting reimagined into a unique art alley.

A former imperial sea-fortress and Soviet prison.

Over time, this castle grew to encompass the entire island.

The reconstruction of this prominent building fulfilled a long-written command.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This 18th-century former mosque held the first Hellenic Parliament.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

This town named for the ancient God of War is home to fewer than a thousand people, but it's the birthplace of the Greek Revolution.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This legendary city has been a tourist attraction for centuries.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.

Where commuters walk through remnants of an ancient Greek necropolis.

This medieval city gate is now a blend of the past and the modern world.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.